After several months of testing, YouTube Go is now available for download via Google Play in India, according to YouTube's blog.

YouTube Go is designed to be offline first, allowing users to download videos and control how much data is used. As Google’s efforts in China have been stunted by government regulation and censorship, India represents the company’s largest opportunity in Asia.

Maintaining data costs for consumers. In partnership with the Indian government, Google implemented free Wi-Fi in 110 railway locations in India. The company is testing Project Loon in India, which uses high-altitude balloons to provide connectivity to rural areas. Google also launched tools that help Indian consumers limit their data usage, such as offline viewing of Chrome websites. These initiatives can help position Google as the first point of contact for Indian users.

Smartphone penetration is growing. At the end of 2015, 16% of India’s population owned a smartphone, and is estimated to reach 58% by the end of 2021, according to Ericsson. Smartphone subscriptions are estimated to reach 810 million in 2021, compared with just 210 million in 2015, which represents a compound annual growth rate (CAGR) of 15%.

Mobile broadband traffic is expanding rapidly in India. While smartphone subscriptions are growing quickly, the traffic generated by these devices is growing even faster. Total mobile traffic in India is estimated to reach 4.5 exabytes (EB) per month in 2021, versus 0.3 EB per month in 2015, a CAGR of 55%.

Consumers continue to increase their time spent consuming digital media, while advertisers continue to increase their ad budgets into digital channels.

The influx is not expected to let up in the near future. The US digital advertising industry will continue to experience remarkable growth through 2021 to reach nearly $100 billion in annual revenue, driven primarily by the sustained migration of ad dollars from traditional TV to digital video and the continued increase of social spending.

Overall, the strong growth of the US digital ad market can largely be attributed toincreased time spent by consumers on digital media and brands' increased comfort with allocating budgets to digital formats, particularly on digital video. In arecent 2016 survey of almost 400 US ad agencies and marketers, the IAB found that two-thirds of respondents plan on increasing spending on digital video in the next year.

Moreover, mobile will become the top destination for digital ad spending as advertisers continue to attempt to resolve the disconnect between the rapid growth in time spent on phones and tablets and the relatively small share of ad budgets that are allocated to such platforms — known as the mobile opportunity gap. In fact, mobile is set to eclipse desktop ad spend by 2018.

US digital ad revenue is expected to reach nearly $100 billion by 2021, according to BI Intelligence estimates.This represents compound annual growth of 8% from the $68.9 billion expected in 2016.

Mobile is positioned to become the top destination for digital ad spending as advertisers continue to attempt to close the "mobile opportunity gap."

Digital video advertising will grow faster than any other segment over the next five years, as consumers shift time spent online to phones and tablets.Revenue in this category is forecast to rise from $8.5 billion in 2016 to $23 billion in 2021.

Social advertising in all formats is gaining traction and will be among the key drivers of digital ad growth in the next five years.Social ad revenue is poised to climb to $30.8 billionby 2021, up from $15.5 billionthis year.

Artificial intelligence, augmented and virtual reality, and sponsored content will help propel further digital ad growth in the next decade.

In full, the report:

Forecasts US digital ad revenue through 2021.

Highlights the rising popularity of digital media with consumers and brands.

Explores why digital video advertising growth will exceed all other formats over the next five years.

Outlines emerging technologies that will help propel ad growth in the next decade.

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